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From: nuny on 16 Jan 2010 05:12 On Jan 15, 5:58 pm, RichD <r_delaney2...(a)yahoo.com> wrote: > is it possible to design a subcutaneous x ray? > A surgeon might want to see a depth just below > where he intends to cut. > > The point is, I thought only bones are opaque to x rays. As has been said, there's more than one way to see through soft tissues. But resolution is never quite the same as with visible light which would be ideal, yes? Mark L. Fergerson
From: Androcles on 16 Jan 2010 05:31 "RichD" <r_delaney2001(a)yahoo.com> wrote in message news:524e9de7-330d-40fd-90f5-0d671ec9ce7d(a)j19g2000yqk.googlegroups.com... > is it possible to design a subcutaneous x ray? > A surgeon might want to see a depth just below > where he intends to cut. > > The point is, I thought only bones are opaque to x rays. The problem is focus. Hold a page of text up at normal reading distance and focus on a few words. Note that background and peripheral objects, although noticeable, are out of focus. Now focus on a background object and note that the writing on the paper is no longer in focus. All lenses, including those in your eyes, have limited distances or ranges in which two objects on different planes (focal planes) may be simultaneously in focus. The solution has been MRI.
From: Salmon Egg on 16 Jan 2010 07:54 In article <a6719983-9175-4673-ae95-8b663cb616a5(a)v25g2000yqk.googlegroups.com>, "nuny(a)bid.nes" <alien8752(a)gmail.com> wrote: > On Jan 15, 5:58�pm, RichD <r_delaney2...(a)yahoo.com> wrote: > > is it possible to design a subcutaneous x ray? > > A surgeon might want to see a depth just below > > where he intends to cut. > > > > The point is, I thought only bones are opaque to x rays. > > As has been said, there's more than one way to see through soft > tissues. But resolution is never quite the same as with visible light > which would be ideal, yes? > > > Mark L. Fergerson That was not was asked. Bill -- An old man would be better off never having been born.
From: a7yvm109gf5d1 on 16 Jan 2010 10:15 On Jan 16, 7:54 am, Salmon Egg <Salmon...(a)sbcglobal.net> wrote: > That was not was asked. Was not was haven't made an album in ten years.
From: AES on 16 Jan 2010 12:26
In article <uwb4n.51075$er1.31895(a)en-nntp-07.dc1.easynews.com>, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: > > This is a very cool coffee-table book on the topic: > http://www.amazon.com/Alien-Vision-Exploring-Electromagnetic-Technology/dp/081 > 9441422 > Indeed, looks quite nicely done, well-written and illustrated, and quite readable -- except doesn't seem to go into important modern laser-based techniques (e.g., no index entry for confocal microscopy). For me at least, a more comprehensive, up to date version might be worth buying at $40; current version would have to be <$15 (shipped). |